The Nonminimal supersymmetric standard model at large tan beta

, the ratio of the vacuum expectation values of the two Higgs doublets, which arise when we impose the constraint of the unification of Yukawa couplings in the model. In this limit we show that the vacuum expectation value of the singlet is forced to be large, of the order of

10

TeV. The singlet decouples from the lightest CP-even neutral Higgs boson and the neutralinos. We compare our results with the corresponding particle spectrum of the Minimal Supersymmetric Standard Model in the same limit. With the exception of the lightest Higgs boson, the particle spectrum in the model turns out to be heavy. The Higgs boson mass, after the inclusion of radiative corrections, is found to be in the neighbourhood of

\sim 130

GeV.

Note:

30 pages plain LaTeX, to be run twice, 4 figures

electroweak interaction
supersymmetry
Higgs particle: multiplet
multiplet: Higgs particle
doublet: 2
Higgs particle: mass
mass: Higgs particle
CP: violation
postulated particle: LSP
mass: LSP

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